# n = 123
# f = 456.789
# s1 = 'Hello, world'
# s2 = 'Hello, \'Adam\''
# s3 = r'Hello, "Bart"'



# print('''当输入完结束符```和括号)后，执行该语句并打印结果。

# 如果写成程序并存为.py文件，就是：''')

# m = 2
# if m >= (5):
#     print('True')
# else:
#     print('False')

# age = 9
# if age >= 18:
#     print('adult')
# elif age >= 6:
#     print('teenager')
# else:
#     print('kid')

# print(10 % 3)
# print(10 / 3)
# print(10 // 3)

# PI = 3.14159265359
# r = 5.0
# s = PI * r * r
# print(s)

n = 123
f = 456.789
s1 = 'Hello, world'
s2 = 'Hello, \'Adam\''
s3 = r'Hello, "Bart"'
s4 = r'''Hello,
Bob!'''

print(n)

# print('I\'m ok')

# print(r'''hello,\n
# world''')

# print(1 > 2)

# print(1 < 2 or 4 > 3)

# print(not 1 < 2)